Answered

Explore a vast range of topics and get informed answers at IDNLearn.com. Join our community to receive prompt, thorough responses from knowledgeable experts.

In which compound is the percent by mass of oxygen greatest?
A. BeO
B. MgO
C. CaO
D. SrO

Sagot :

Curtiidn
The answer is A
Hide the Oxygen for a minute
Mass of elements:
Be:9.012
Mg:24.305
Ca:40.078
Sr:87.62
Out of all these choices, Be is the lightest

Answer: BeO

Explanation:

percent by mass of oxygen[tex]=\frac{\text {mass of oxygen}}{\text {Total mass of substance}}\times 100\%[/tex]

percent by mass of oxygen in BeO[tex]=\frac{16g}{25.01g/mol}\times 100=63.97\%[/tex]

percent by mass of oxygen in MgO[tex]=\frac{16g}{40.30g/mol}\times 100=39.70\%[/tex]

percent by mass of oxygen in CaO[tex]=\frac{16g}{56.08g/mol}\times 100=28.53\%[/tex]

percent by mass of oxygen in SrO[tex]=\frac{16g}{103.62g/mol}\times 100=15.44\%[/tex]

We are delighted to have you as part of our community. Keep asking, answering, and sharing your insights. Together, we can create a valuable knowledge resource. Your questions deserve reliable answers. Thanks for visiting IDNLearn.com, and see you again soon for more helpful information.